Typewriting machine



Sept, l, l 925.

1 d. AB. coRcoRvAN l TYPEWRI TING MACHINE Fild June 26, 1924 lio 'sheet, the type-heads springing APatented Sept. 1, 1925.

j UNITED STATES PATENT OFFICE.

vCORNELIUS BL CORCRAN, DECEASED, LATE -OF NEW YORK, N. Y.; BY MICHAEL J.CORUORAN, ADMINISTRATOR, OAF NEW YORK, N. Y., ASSIGNOB T0 UNDEBWOODTYPEWBITEB COMPANY, 0F NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

4rnurwm'rme MACHINE. I.

appnoauon ma :une ne, m4. serial Na. 129,482.

To all whom z't may concern:

Be it known that CORNELIUS B. CoRoonAN, deceased, late a citizen of theUnited States, and late residing in the boron h of Bronx, county ofBronx, city and tate of New York, invented certain new and useful1mprovements in Typewriting Machines, of which`the following is aspecification.

This invention `relates to typewriting machines of the front-striketype, in which the type-bars are mounted on a curved wire carried by asegment. Usually the blows of the type-bar are stopped, just beforecontact of the t pes with the platen, by a rigid rtion o the type-barsegment to avoid t le tendencyof the type-bar to chatter and makerepeated 'impressions on a workbeyond a stop suliciently to deliver awhip-like blow upon the work-sheet.

Such impact of the metal surfaces pro# duces an annoying clatteringnoise of considerable intensit and it is therefore one of the features othis invention to provide an improved separate stop .designed to deaden`such sounds without lessening the advantages of a rigid anvil ortype-bar stop l formed directly on the segment.V

It is a further feature to provide a stop readily removable when worn,that is moderately ieldable, tending to reduce the shock ofY thetype-bar and preventing it .from being transmitted to other parts of themachine, thus further reducing the noise can be readily applied withoutany changes in the typewriting machine.

These features are accomplished by securing a segmentalsprin sto uponthe face of the segment, in which t e type-bars are pivoted, making useof openings which already exist therein for attaching purposes, the stopbeing provided with sound-reducing means known to be effective and somounted as to prevent the emission of noise to a marked extent.

Other features and advantages will hereinafter appear.4

In" the accompanying drawings,

Figure 1 isa front elevation of a typei, bar segment as used with amachine of the Underwood type, showing an embodiment of the ,inventlonas applied, the platen ap caring in dot-and-dash lines.

igure 2 is a transverse sectional view of the same, the section beingtaken on line 2-2 of Figure 1, and a type-bar shown in dotanddash` linesas connected to the segment, both in raised and lowered Fi nre 3 is aview similar to igure 1, but s owing a modified form of the stopbaranvil.

Figure 4 is a transverse sectional view, taken on' line 4 4 of Figure 3.

In the accompanyino drawings, such parts of a typewriting machine areshown as relate only to the invention, all other parts beingof ordinaryconstruction and unrelating'to this disclosure.

he platen, generally designated by the numeral 10, is of the cylindricaltype, shift- 1positions.

able into upper andlower case position to receive the impact from thetype .characters carried on type-heads 11, these heads bein fixed onfree ends of type-bars 12 pivote on a rod 13 and actuated by links 14engaging the'bar's near their pivoted ends.

The type-bars shown are of the Underwood style, andthe links 14, as willbe understood, are moved by their connections with key-actuated leverson the keyboard of the machine in the ordinary manne/r, such parts beingomittedl from the-.drawings The rod 13 is mounted in the lower part of atype-bar segment 15, the same having slots 16 to actuate the type-bars12 and an extending rib 17 adjacent to which the type- .barsmove when inposition to make an impression on the platen. The segment 15 is fixedrigidly by screws 18 to a front portion of the typewriting` machineframe, indicated by the numeral 19, the construction of themachine'being well known.

As shown in Figures 1 and 2, a stop comprising two similar butoppositely-'disposed stop, and to further reduce the noise the slightlyoffset towards the supporting sur-V face \20, or, if preferred, providedwith washers 28, to raise the smooth' lever under surface of the stopslightly away form the surface 20, such offset presenting a space ofonly a few thousandths of an inch' in extent, and passing through aperfora- `tion in' each pad are binding screws 29 hold,- ing the stopfirmly in engagement with the segment. i"

From. the foregoin it will be clear that when a type-bar stri es thestop, the stop, will be momentarily deliected to make contact with theface of the segment, recoverying instantlyafter the impact, suchyielding of the stop in no wise interfering with its arresting eifect,but serving to cushion the blow to prevent sound emission, suchlsilencing effect being increased dueto peculiarity of its structure.

fn `the modificationshown in Figures 3 and 4, the stop 31 is integrallyformed from a single piece of metal having broadly curved ends 32 fromwhich extend arms 33 spaced closel their ends 34 through which passscrews 35" securing the stop spaced from the face of the segment 15 inthe manner before described.

The inner adjacent side of the stop contains a plurality ofclosely-spaced openings 36 extending partially through the material ofthe stop, and set firmly in. each opening isa plug37 of relatively soft,dense material, as lead, actfing to reduce the vibrant quality of themetal stop and to correspondingly lessen the sound of thetype-bar blow Iscope of the Y tance therefrom, said stop having a plurality ofV closelyspaced recesses in its under surface, said stop being mounted to springagainst the sup ort when struck by a typebar, anda lea plug' fixed ineach of the mentioned recesses. f n

2. The combination with a typewriting machine having type-bars and asegmental concentric to the curved f klower edge o the stop, and beingoffset at support therefor, of an arcuate stop having spring armssecured at their ends to the face of the support, means for spacing thestop and' arms slightly from the support, and means in the stop toreduce sound upon its being struck by a type-bar.

`3. The combination with a typewriting machine havingy type-bars and asegmental presenting a relatively narrow contact surface and containinga plurality of openings in its iower surface, arms integral with theends of the stoo said arms being curved to extend alon'rioe the convexedge of the stop towards each other, and provided with openings toreceive securing means engagedy in the support, means at the ends of thearms to raise the stop minutely from the surface of the support, andleaden plugs fixed ,in the mentioned openings.

5. The combination with a typewriting machine having type-bars and asegmental support therefor, of a stop shaped to conform with the supportand intercept each of the type-bars at their impression strokes, saidstop'being composed of two like sec@ tions arranged in opposed relation,each section having. openings in their under surfaces and re-entrantlyturned arms at their ends, means at the ends of the arms by which thestop may be secured to the support, other means for holding the stopminutely spaced from the support, and means for unitingy the 'adjacentends of the stop sections.

6. The combination with a typewriting machine having type-bars and asegmental support therefor, o-f a stop' shaped to conform with thesupport and intercept each of the type-bars at their impression strokes,said stop being composed of two like sections arranged in opposedrelation, each section having openings in their under surfaces andreentrantly turned arms at their ends, means to spacedly secure the armsto said support, and a plate riveted to the inner adjacent ends of thesections, said late being level with the under'. surface o the stop. Y

f MICHAEL J. CORCORAN, Administrator of the estatey of @ormz'us B.

Corcoran, deceased'.

type-bars at their impression strokes,said stop d

